Debian is an Operating System that uses the Linux kernel. Although it is usually installed on desktops, it's being used on an increasing number of web servers too. The reason is that it's really stable, so a server running it won't have to be restarted for months. Debian is also considered to be one of the most safe Operating Systems to be found, because security patches are released within days after a problem is discovered. This is possible because thousands of skilled developers are part of the Debian project on a voluntary basis and not only do they work on the OS itself, but they also provide 24/7 support via special e-mail lists and reply in twenty minutes to any question. In this light, you will obtain an outstanding level of support directly from the developers who know their own platform in depth, and not from a third-party support team. Debian is also one of the Linux distributions with the highest number of packages - over 30,000. Since the Operating System is free to use, you will be able to modify both the core as well as all the packages in the way you see fit. Also, you will not be required to pay any kind of license fees.